Preheat oven to 350*. Spray a large baking sheet with the cooking spray.
In a medium size bowl, combine the diced banana and the chocolate morsels and mix gently.
Put the wonton wrappers on a flat surface. Drop by teaspoonful's of the banana mixture onto center of each of the wonton's. Moisten the edges of the wonton's with wet fingers and fold one corner to make a triangle and gently press the sides together to seal. Transfer the filled wrappers to the prepared baking sheet.
Bake wonton's 10 to 12 minutes or until golden brown. Sift the powdered sugar over the chocolate filled wonton's right before serving.